Botany is based on fixed genera.

The plant kingdom covers the entire earth, offering our senses great pleasure and the delights of summer.

When all the thoughts are concerning one thing and the person loses interest in other things, the melancholy begins.

There are some viviparous flies, which bring forth 2,000 young. These in a little time would fill the air, and like clouds intercept the rays of the sun, unless they were devoured by birds, spiders, and many other animals.

The species and the genus are always the work of nature [i.e. specially created]; the variety mostly that of circumstance; the class and the order are the work of nature and art.

Linnea.... A plant of Lapland, lowly, insignificant, disregarded, flowering but for a brief space - from Linnaeus who resembles it.

If you do not know the names of things, the knowledge of them is lost, too.